Test Apparatus for the Evaluation of the Behaviour of Smoke Detectors in Non-fire Situations
In contrast to the well standardised methods for the evaluation of the detection capability of a smoke detector, there is a lack of a reproducible and representative test method concerning the false alarm susceptibility. The European Standard EN54 defines a series of tests to prove and certify the functionality of smoke detectors, i.e. to prove that the detector is able to detect a fire in a prescribed period of time. Unfortunately the complex problem of avoiding false alarms is not addressed. The consequences of false alarms should not be underestimated, as they may cause several costs to the operator, especially in airborne applications. This paper presents a new approach for the test of smoke detectors regarding their susceptibility to false alarms due to nuisance aerosols, like steam and dust. Fog and spray tests in the developed set-up are intended. Target of the project was the development of a standardised test method for sensitivity of fire detectors to hazardous substances. The presented test apparatus has been developed in a cooperation of Airbus and the University of Duisburg-Essen and can contribute to a test standard. The design is similar to the EN54 test duct, however due to its small volume of only around 32 1 the duct is much smaller, easier to clean, portable and cheaper. For an accurate and reproducible aerosol feeding the duct has been combined with a commercialised particle generator. The particle generator Palas RBG 1000 disperses a pre-defined amount of standardised dusts. With the developed duct, detector tests under different flow directions and velocities can be performed in the same way as with the EN54 test duct. An optical reference measurement of the aerosol concentration is performed by a light extinction path in the infrared range. The duct allows a qualitative statement on the sensitivity of the tested detector regarding nuisance aerosols. The method is designed to be reproducible and different sufficient linear ramps can be preset. Also a slow pollution with dust of the measuring chamber can be emulated. The achieved results during this study are a promising first step for the development of a new test standard.
test apparatus false alarm susceptibility smoke detector dust
KR(U)ELL Wolfgang SCHULTZE Thorsten WILLMS Ingolf FREILING Andre
Department of Communication Systems, University of Duisburg-Essen, Duisburg 47057, Germany Department of Communication Systems, University of Duisburg-Essen, Guisburg 47057, Germany Airbus Operations GmbH, Bremen, Germany
国际会议
The 2010 International Symposium on Safety Science and Technology(2010 安全科学与技术国际会议)
杭州
英文
353-364
2010-10-26（万方平台首次上网日期，不代表论文的发表时间）